ntegrityError: (1062, "Dubbele vermelding '523' voor sleutel 'user_id'") Bestand "django / db / backends / utils.py", regel 84, in _execute return self.cursor.execute (sql, params) Bestand "django /db/backends/mysql/base.py ", regel 71, in execute return self.cursor.execute (query, args) Bestand" MySQLdb / cursors.py ", regel 206, in execute res = self._query (query) Bestand "MySQLdb / cursors.py", regel 319, in _query